Implement isNumber pipe

src-ui/src/app/components/document-list/document-card-small/document-card-small.component.html

@@ -65,7 +65,7 @@
             <small>{{document.created_date | customDate:'mediumDate'}}</small>
           </div>
         </div>
-        <div *ngIf="document.archive_serial_number" class="ps-0 p-1">
+        <div *ngIf="document.archive_serial_number | isNumber" class="ps-0 p-1">
           <svg class="metadata-icon me-2 text-muted" fill="currentColor">
             <use xlink:href="assets/bootstrap-icons.svg#upc-scan"/>
           </svg>

src-ui/src/app/components/document-list/document-card-small/document-card-small.component.spec.ts

@@ -21,6 +21,7 @@ import { of } from 'rxjs'
 import { By } from '@angular/platform-browser'
 import { TagComponent } from '../../common/tag/tag.component'
 import { PaperlessTag } from 'src/app/data/paperless-tag'
+import { IsNumberPipe } from 'src/app/pipes/is-number.pipe'
 
 const doc = {
   id: 10,
@@ -62,6 +63,7 @@ describe('DocumentCardSmallComponent', () => {
         IfPermissionsDirective,
         SafeUrlPipe,
         TagComponent,
+        IsNumberPipe,
       ],
       providers: [DatePipe],
       imports: [